6540( 6) - 12/18/97 15:05 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6540 Version: 6 Check-in Date: 18-Dec-1997 15:03:44 1.Proposal Title: Imaging Circumstellar Nebulae around Luminous Blue Variables in the Magellanic Clouds ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 6 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Regina E. Schulte-Ladbeck UNIVERSITY OF PITTSBURGH CoI: Antonella Nota Space Telescope Science Institute N CoI: Mark Clampin Space Telescope Science Institute N CoI: Mario Livio Space Telescope Science Institute N CoI: Claus Leitherer Space Telescope Science Institute N CoI: Anna Pasquali Space Telescope Science Institute N ------------------------------------------------------------------------------------ 5. Abstract We propose to exploit the unique spatial resolution of the Planetary Camera to image circumstellar ejecta of hot and luminous stars in the Magellanic Clouds (MCs), where ground- based imaging of new, spectroscopically discovered nebulae is difficult and cannot provide meaningful spatial information. The objectives are to study the distribution of the ionized gas and dust in order to determine the morphology and physical properties of the circumstellar nebulae, by observing them in a narrow, line-free V continuum filter and in the HAlpha emission line. These data will provide information about the mass-loss history of the central stars, important for understanding the evolution of massive stars and of the interstellar medium of their host galaxies. Two aspects of this proposal are of particular significance: the study of the nebular morphology, to provide input to hydrodynamic models now becoming available, and the determination of the total mass ejected, which can now be predicted with the latest theoretical models of massive-star evolution. This promises to supply us with a much better knowledge of the statistical properties of LBV nebulae, which is needed to test evolutionary models. There is a larger number of LBVs and candidates known in the MCs than in the Galaxy, and only HST is capable to provide sufficent spatial resolution to study them. ------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 2] Observations Description ------------------------ We propose to use the WFPC2 Planetary Camera to obtain high spatial resolution images of a number of LBVs and candidates in the MCs, with the primary objective of characterizing the observational properties of their circumstellar shells. The Planetary Camera is the ideal instrument for this investigation, for three reasons: beginitemize em high angular resolution (0.046"/pixel) of the Point Spread Function, combined with a relatively large field of view (35"*35"); em good spectral response at the wavelengths of interest; em suitability of the CCD cameras for observations requiring high dynamic range, as WFPC2 CCDs have MPP architecture (see WFPC2 Handbook, 1995), and, therefore, limited blooming on saturated stars. enditemizeFor each object of the sample, we propose to take PC images in the following filters: 547M - V Continuum, and F658N - HAlpha. Our observational strategy will be to obtain two images of each object/filter combination, to properly correct for cosmic rays. The exposure time for each of the two images has been calculated in order to achieve a S/N of 10 in the nebular region, while saturating the central object. On the basis of the WWW WFPC2 exposure time estimator and the WFPC2 handbook, using the PC camera and the F547M filter for a star with V = 11 and surface brightness in the nebula of ~eq 18 magnitudes/square arcsecs, two exposures of 300 secs, for each filter, will achieve a S/N per pixel of 10. For the H Alpha emission, assuming a typical line flux of 6times10^-14 ergs/sec/cm^2/arcsec^2, we derive a S/N per pixel of 10 for two 500 sec exposures. The stars themselves will saturate columns contained within a radius of approximately 0.3 arcsecs. For all exposures we will operate the CCDs with the serial clockss running in order to remove excess charge from saturated columns and prevent charge spreading to adjacent columns. This strategy has already proven successful, allowing us to obtain excellent images of AG Carinae (Proposal 5149). Including the Guide Star Acquisitions and the exposure overheads, the complete set of observations for each target requires 45 minutes, half a CVZ orbit. All of the targets are in the CVZ and are physically close together, so that we can make very efficient use of the allocated time, by observing two of the LMC targets per CVZ orbit. The total time required amounts to 6 CVZ orbits. All of the observations will be taken in CVZ. The CVZ orbits will be used to observe multiple targets. Targets have been ordered so to minimise slew time and length. A bug in RPS2 calculates slew times that are incorrect. We have obtained the correct slew times from R. Henry and finetuned the exp. times using these numbers. The current version of the proposal exceeds the TAC allocation of 6 orbits by approximately 22 min, because in the version the slews are still calculated incorrectly. The proposal needs to be rerun after RPS2 has been fixed. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 3] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: ------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD35343 EXT-STAR,EMISSION LINE RA=05H 18M 14.84S +/-0.5S, DEC=- J2000 V = 9.97 STAR,LUMINOUS BLUE 69D 15' 00.2" +/-0.5", PLATE- B-V = +0.11 VARIABLE ID=05ZW 2 HD269858 EXT-STAR,EMISSION LINE RA=05H 36M 43.64S +/-0.5S, DEC=- J2000 V = 11.16 STAR,LUMINOUS BLUE 69D 29' 45.9" +/-0.5", PLATE- B-V = -0.07 VARIABLE ID=05ZW 3 S119 EXT-STAR,EMISSION LINE RA=05H 31M 25.97S +/-0.5S, DEC=- J2000 V = 11.90 STAR,LUMINOUS BLUE 69D 05' 37.9" +/-0.5", PLATE- B-V = -0.07 VARIABLE ID=05ZW 4 HD269006 EXT-STAR,EMISSION LINE RA=05H 02M 07.87S +/-0.5S, DEC=- J2000 V = 9.83 STAR,LUMINOUS BLUE 71D 20' 12.8" +/-0.5", PLATE- B-V = +0.19 VARIABLE ID=05ZW 5 HD269929 EXT-STAR,EMISSION LINE RA=05H 38M 51.91S +/-0.5S, DEC=- J2000 V = 12.20 STAR,LUMINOUS BLUE 69D 08' 07.2" +/-0.5", PLATE- VARIABLE ID=05ZW 6 HD5980 EXT-STAR,LUMINOUS BLUE RA=00H 59M 26.72S +/-0.5S, DEC=- J2000 V = 11.69 VARIABLE 72D 09' 55.4" +/-0.5", PLATE- B-V = -0.20 ID=06B1 7 S61 EXT-STAR,EMISSION LINE RA=05H 45M 52.27S +/-0.5S, DEC=- J2000 V = 12.01 STAR,LUMINOUS BLUE 67D 14' 25.6" +/-0.5", PLATE- B-V = -0.13 VARIABLE ID=06B0 8 HDE269927C EXT-STAR,EMISSION LINE RA=05H 38M 58.50S +/-0.5S, DEC=- J2000 V = 12.48 STAR,LUMINOUS BLUE 69D 29' 20.9" +/-0.5", PLATE- B-V = -0.11 VARIABLE ID=05ZW 9 HD269445 EXT-STAR,EMISSION LINE RA=05H 23M 00.26S +/-0.5S, DEC=- J2000 V = 11.45 STAR,LUMINOUS BLUE 68D 01' 46.8" +/-0.5", PLATE- B-V = +0.27 VARIABLE ID=05ZW 10 BE381 EXT-STAR,EMISSION LINE RA=05H 35M 54.61S +/-0.5S, DEC=- J2000 V = 13.26 STAR,LUMINOUS BLUE 68D 59' 08.4" +/-0.5", PLATE- B-V = +0.04 VARIABLE ID=05ZW 6540( 6) - 12/18/97 15:05 - [ 5] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 102 S61 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 103 S61 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 104 S61 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 6] Visit: 02 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 112 BE381 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 113 BE381 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 114 BE381 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 7] Visit: 03 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 121 S119 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 122 S119 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 123 S119 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 8] Visit: 04 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 131 HD269858 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 20 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 132 HD269858 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 133 HD269858 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 9] Visit: 05 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 140 HD269445 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 141 HD269445 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 142 HD269445 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 10] Visit: 06 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 150 HD269929 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 151 HD269929 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 152 HD269929 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 11] Visit: 07 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 160 HD269006 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 161 HD269006 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 162 HD269006 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 12] Visit: 08 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 170 HD35343 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 171 HD35343 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 172 HD35343 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 13] Visit: 09 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 180 HDE269927C WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 181 HDE269927C WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 182 HDE269927C WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 14] Visit: 10 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 190 HD5980 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 10 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 191 HD5980 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 1 60 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 192 HD5980 WFPC2 IMAGE PC1 F656N CR-SPLIT=0.5,CLOCKS=YES, 2 1000 S ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ 6540( 6) - 12/18/97 15:05 - [ 15] Summary Form for Proposal 6540 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.5 CLOCKS=YES ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F656N ------------------------------------------------------------------------------------------------------------------------------------ Target Names S61 BE381 S119 HD269858 HD269445 HD269929 HD269006 HD35343 HDE269927C HD5980 ------------------------------------------------------------------------------------------------------------------------------------